Better late than never, but looks like Google will be fixing the issue on their side of things.... https://www.engadget.com/2018/01/19/google-rolls-out-patch-chromecast-wifi-bug/

So what about V3? Is there a firmware update for V3 yet? Both V1 and V2 have official updates on the website, but nothing yet for V3. If it's forthcoming very soon, I'll wait. Otherwise, I need to...